双吸离心泵空化性能试验验证与数值模拟  

Test Validation and Numerical Simulation of Cavitation Performance of Double Suction Centrifugal Pump

作　　者：孟根其其格 宋宇[2,3,4] 王欣[1] MENG Genqiqige;SONG Yu;WANG Xin(Inner Mongolia Vocational College of Chemical Engineering,Hohhot 010070,Inner Mongolia,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Collaborative Innovation Center of Advanced Nuclear Energy Technology,Tsinghua University,Beijing 100084,China;Key Laboratory of Advanced Reactor Engineering and Safety,Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]内蒙古化工职业学院,内蒙古呼和浩特010070 [2]清华大学核能与新能源技术研究院,北京100084 [3]清华大学先进核能技术协同创新中心,北京100084 [4]清华大学先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《水力发电》2019年第10期70-74,共5页Water Power

基　　金：国家自然科学基金资助项目(51579006、51679122);内蒙古自治区高等学校科学研究项目(NJZY17450)

摘　　要：对一台双吸离心泵的能量特性和空化外特性进行了试验测量,基于SST k-ω湍流模型及Zwart-Gerber-Belamri空化模型对双吸离心泵内部流动进行数值模拟,计算得到的双吸离心泵扬程曲线、效率曲线及扬程随有效空化余量变化曲线与试验结果吻合较好。数值模拟结果表明:随着有效空化余量的减小,叶轮内低压区从叶轮进口处向出口处渐渐扩大,叶轮内空化沿叶片吸力面从叶片头部向叶片尾部逐渐发展,并集聚在叶片吸力面顶部附近;泵扬程下降的主要原因是叶轮内空泡的阻塞作用,并叶轮内空化发展到一定程度时叶轮流道内出现旋涡区,使影响叶轮内部流态,导致泵扬程突降。The energy and cavitation performances of a double suction centrifugal pump are tested on a standard experiment rig,and the cavitation flow in pump interior are numerically simulated by using SST k-ω turbulence model and Zwart-Gerber-Belamri cavitation model.The calculated head curve,the efficiency curve and the variation curve of pump head with available net positive suction head are in good agreement with the experimental results.The simulation results demonstrate that,(a)with the decrease of available net positive suction head,the low pressure area in impeller expands gradually from impeller inlet to outlet,and the bubbles in impeller passage develops gradually from blade leading edge to tail along blade suction side and gathers near the top of blade suction side;and(b)the drop of pump head is mainly caused by the cavity block function in the impeller,and when the cavitation in impeller passage develops to a certain extent,the vortex zone appears in impeller passage,which affects the flow pattern inside the impeller and causes the pump head to drop suddenly.

关 键 词：双吸离心泵 试验 数值模拟 空化性能 

分 类 号：TH311[机械工程—机械制造及自动化]